It's a split advertisement, so it's a vertical split advertisement.
So AB=BD because ABCD is a diamond.
So AB=AD, so the triangle ABD is an equilateral triangle.
So ∠A=∠C=60
So ∠ d = ∠ ABC =180-60 =120.
Because Abe = CBF =180-90-60 = 30.
So ∠EBF= 120-30-30=60.
I hope to adopt O (∩ _ ∩) O. Thank you.